20502736 has 40 divisors (see below), whose sum is σ = 41559840. Its totient is φ = 9788544.

The previous prime is 20502733. The next prime is 20502751. The reversal of 20502736 is 63720502.

It is a self number, because there is not a number n which added to its sum of digits gives 20502736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34635 + ... + 35221.

It is an arithmetic number, because the mean of its divisors is an integer number (1038996).

Almost surely, 2^20502736 is an apocalyptic number.

It is an amenable number.

20502736 is an abundant number, since it is smaller than the sum of its proper divisors (21057104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20502736 is a wasteful number, since it uses less digits than its factorization.

20502736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20502736 is about 4527.9946996435. The cubic root of 20502736 is about 273.6973588513.

The spelling of 20502736 in words is "twenty million, five hundred two thousand, seven hundred thirty-six".